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Metallic hydrogen under high pressure is believed to be a room-temperature superconductor. However, there are no experimental evidence for the predicted metallic state. As an alternative, hydrogen-dominated materials can metallize at lower pressures because of chemical pre-compressions, which are potential high temperature superconductors. Therefore, hydrogen-dominated materials are expected to become a new member of superconductor family: hydrogen-based superconductor.Here, we theoretically predicted H3S with Im-3m symmetry to be a high-temperature superconductor with Tc reaching as high as 200 K at high pressure and proposed that H3S can be formed at high pressure by two main ways: 3H2S→2H3S+S, 2H2S+H2→2H3S [1]. Then, these results have been confirmed by several in situ high pressure experiments[2-4]. Furthermore, we also explored high temperature superconductivity in other hydrogen-dominated materials at high pressures, including ternary hydrides.[1] D. Duan, T. Cui, et al. Sci. Rep.,4, 6968 (2014); D. Duan, T. Cui, et al. Phys. Rev. B,91, 180502 (2015).[2] A. P. Drozdov, M. I. Eremets, et al. Nature, 252, 73-76 (2015).[3] M. Einaga, K. Shimizu, et al. Nature Phys., 12, 835-838 (2016).[4]X. Huang, T. Cui, et al. arXiv:1610.02630 (2016).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.X38.7